CN104481575B - A kind of vapours displacement gas improves the method for gas pumping efficiency - Google Patents
A kind of vapours displacement gas improves the method for gas pumping efficiency Download PDFInfo
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- CN104481575B CN104481575B CN201410621327.0A CN201410621327A CN104481575B CN 104481575 B CN104481575 B CN 104481575B CN 201410621327 A CN201410621327 A CN 201410621327A CN 104481575 B CN104481575 B CN 104481575B
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- steam
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- vapours
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
A kind of vapours displacement gas improves the method for gas pumping efficiency, it is adaptable to improve the extraction efficiency, the particularly extraction of underground coal mine low air permeability coal seam gas of coal bed gas. First construction mash gas pumping drilling in coal seam, sends vapours transfer pipeline into bore inner, and is caused by pipeline outside boring, connects stop valve; Again stop valve is connected to explosion-proof steam generator by vapours transfer pipeline, steam gage and another one stop valve are installed at steam generator outlet place, install steam-water separator in duct height step-down corner, steam-water separator outlet connects drain valve group; By relief valve with in penstock installation to boring; Draw extraction arm to firedamp taking-out discharging drilling from gas drainage under suction main, by borehole sealing, and close the valve on arm; Open the valve on steam conveying pipe, note high-temperature steam in boring; Valve on steam off generator and conveyance conduit successively after 1 hour, opens the valve on extraction arm, carries out gas drainage under suction.
Description
Technical field
The present invention relates to a kind of method that vapours displacement gas improves gas pumping efficiency, be particularly suited for coal mine and bend down the efficient extraction of gas in absorption coal seam ventilative, high.
Background technology
Gas contained by China's high-order coal and low-order coal accounts for more than 2/3 in total resources, and it is special that gas (coal bed gas) tax is deposited: have the feature of micropore, low-permeability, high absorption. Coal seam permeability on average only has 1.1974 �� 10-18��1.1596 �� 10-14m2. Wherein permeability is less than 0.1987 �� 10-16m2Account for 35%, 0.1987 �� 10-16��0.1987 �� 10-15m2Account for 37%, more than 0.1987 �� 10-15m2Only account for 28%. U.S.'s coal bed gas Ground Developing constituency usually requires that the permeability in coal seam is not less than 0.1987 �� 10-15m2, and the projecting coal bed permeability of China's high methane is generally smaller than 0.1987 �� 10-15m2. External ground gas extraction technology is primarily suitable for the feature of scala media coal (Thief zone, weakly stable), do not adapt to China's high-order coal and the feature of low-order coal (hyposmosis, by force absorption), advanced foreign technology is practice have shown that China applies: the effective radius of influence of extraction only has the 1/3��1/2 of the U.S., average single well tolerance only has the 1/5��1/3 of the U.S., and extraction efficiency is low. Currently; the common employing of China improves the method for coal body breathability to improve gas pumping efficiency; namely in coal seam, fracture network is produced by certain technical measures; promote to be adsorbed on the desorption of mash gas within coal body, flowing, such as exploitation protective layer, high-pressure water jet slot, deep hole standing shot and fracturing etc. But, these methods can only improve extraction efficiency from improving gas permeability of coal seam angle, and coal seam also has the feature of high absorption, even if creating crack, gas in coal body micropore also is difficult to desorbing, migration, causes still having a large amount of Gas when later stage coal seam driving or back production.
Summary of the invention
Technical problem: the present invention seeks to for weak point of the prior art, a kind of method that vapours displacement gas improves gas pumping efficiency is provided, utilizing vapours to add coal heating, promoting to be adsorbed on the desorption ability of the gas of coal body pore interior, thus improving the gas drainage results of gas.
Technical scheme: the vapours displacement gas of the present invention improves the method for gas pumping efficiency, including mash gas pumping drilling of constructing in coal seam, comprises the steps:
A. bottom the mash gas pumping drilling constructed, send into steam conveying pipe, and be respectively provided with the relief tube stretching into mash gas pumping drilling orifice place and gas pumping arm at the upper and lower of steam conveying pipe, routinely mash gas pumping drilling is carried out sealing of hole;
B. the steam conveying pipe stretching out mash gas pumping drilling exposed junction is connected with the explosion-proof steam generator being located near boring, and the gas pumping arm warp stretching out mash gas pumping drilling exposed junction is connected with gas pumping main with gate valve, outlet pressure table and relief valve are installed on the relief tube stretching out mash gas pumping drilling exposed junction successively simultaneously;
The pipeline that described steam conveying pipe is connected with explosion-proof steam generator is provided with steam-water separator in duct height step-down corner, and the water outlet of steam-water separator is provided with drain valve group to be had; The steam conveying pipe of described boring exposed junction is provided with stop valve, and the export pipeline that described explosion-proof steam generator is connected with steam conveying pipe is sequentially provided with steam gage and stop valve;
C. opening steam generator, open two stop valves on vapours transfer pipeline, in boring, note high-temperature steam, reaches after setting pressure until steam pressure, two stop valves on steam off generator and steam conveying pipe;
D. open the gate valve on extraction arm, carry out gas drainage under suction.
The temperature of described high-temperature steam > 100 DEG C.
The setting pressure that described steam pressure reaches is 0.7��1MPa.
Described relief valve is fall lift type spring safety valve.
Described steam gage adopts cock valve and condensed water bend pipe to be connected on steam conveying pipe.
The appearance of described vapours transfer pipeline has glass wool material heat-insulation layer.
Beneficial effect: owing to have employed technique scheme, the present invention utilizes vapours to add coal heating, promotes to be adsorbed on the desorption ability of the gas of coal body pore interior, thus improving the gas drainage results of gas. After being heated due to coal body, the desorbing of gas, migration can aggravate, and the gas of its internal residual can discharge in a large number, therefore, utilize vapours heating coal seam, then carry out extraction immediately, and the gas bearing capacity within coal body will be substantially reduced. Free gas and adsorption gas two parts are mainly comprised due to the gas in coal seam, general gas pumping technology can only extraction free gas, even if after taking the strengthening anti-reflection technology of release, portion of residual desorption of mash gas also can only be promoted, coal seam driving or recovery process still have a large amount of Gas. And this technological invention is compared with prior art, more can be effectively promoted a large amount of desorbings of remaining gas, improve the extraction efficiency of gas, the gas emission in coal seam driving or recovery process can be substantially reduced.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the invention method schematic diagram.
In figure: 1-coal seam; 2-mash gas pumping drilling; 3-stop valve; 4-steam conveying pipe; The explosion-proof steam generator of 5-; 6-steam gage; 7-drain valve group; 8-steam-water separator; 9-pipeline height turns round; 10-relief valve; 11-outlet pressure table; 12-gas pumping arm; 13-gate valve; 14-gas pumping main.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention is further described:
The vapours displacement gas of the present invention improves the method for gas pumping efficiency, specifically comprises the following steps that
A. first in coal seam construct mash gas pumping drilling 2, then bottom the mash gas pumping drilling 2 constructed, send into steam conveying pipe 4, and it is respectively provided with, at the upper and lower of steam conveying pipe 4, the relief tube and gas pumping arm 12 that stretch into mash gas pumping drilling 2 aperture place, routinely mash gas pumping drilling 2 is carried out sealing of hole;The appearance of described vapours transfer pipeline 4 has glass wool material heat-insulation layer.
B. the steam conveying pipe 4 stretching out mash gas pumping drilling 2 exposed junction is connected with the explosion-proof steam generator 5 being located near boring, and the gas pumping arm 12 of mash gas pumping drilling 2 exposed junction will be stretched out through being connected with gas pumping main 14 with gate valve 13, outlet pressure table 11 and relief valve 10 are installed on the relief tube stretching out mash gas pumping drilling 2 exposed junction successively simultaneously; Described relief valve 10 is fall lift type spring safety valve;
The pipeline that described steam conveying pipe 4 is connected with explosion-proof steam generator 5 is provided with steam-water separator 8 at duct height step-down 9 places of turning round, and the water outlet of steam-water separator 8 is provided with drain valve group 7; The steam conveying pipe 4 of described boring exposed junction is provided with stop valve 3, and the export pipeline that described explosion-proof steam generator 5 is connected with steam conveying pipe 4 is sequentially provided with steam gage 6 and stop valve 3; Described steam gage 6 adopts cock valve and condensed water bend pipe to be connected on steam conveying pipe 4.
C. steam generator 5 is opened, open two stop valves 3 on vapours transfer pipeline 4, note high-temperature steam in boring, the temperature of high-temperature steam > 100 DEG C, reach after setting pressure until steam pressure, the setting pressure that steam pressure reaches is 0.7��1MPa, steam off generator 5 and two stop valves 3 on steam conveying pipe 4;
D. open the gate valve 13 on extraction arm 12, carry out gas drainage under suction.
Gas pre-drainage is carried out for certain driving face in coal mine, mash gas pumping drilling 2 of first constructing in coal seam 1, vapours transfer pipeline 4 is sent into boring 2 internal from the bottom of hole 1 meter of, and pipeline is caused outside boring 2, connect steam valve 3;
Vapours transfer pipeline 4 is connected to explosion-proof steam generator 5, steam gage 6 and stop valve 3 is connected in steam generator 5 exit, wherein steam gage 6 to use cock valve and condensed water bend pipe to be connected on steam conveying pipe 4, pipeline height turn round 9 places install steam-water separators 8, steam-water separator 8 outlet connect drain valve group 7;
Relief valve 10 steel pipe 4 is connected in boring 2, when steam pressure is too high, the relief valve 10 automatic blood pressure lowering of meeting, it is prevented that in boring, steam pressure is too high; Drawing extraction arm 12 to firedamp taking-out discharging drilling 2 from gas drainage under suction main 14, extraction arm is installed gate valve 13, extraction arm 12 is connected to firedamp taking-out discharging drilling 2, close the gate valve 13 on arm, boring 2 sealed, sealed borehole length is 3 meters;
Opening the valve 3 on steam conveying pipe 4, regulate steam generator 5 and make vapor (steam) temperature be higher than 100 DEG C, steam pressure reaches 0.7MPa, note high-temperature steam in boring, steam injection valve 3 on steam off generator 5 and conveyance conduit successively after 1 hour; Open the gate valve 13 on extraction arm 12, carry out gas drainage under suction.
Claims (6)
1. the method that vapours displacement gas improves gas pumping efficiency, including mash gas pumping drilling (2) of constructing in coal seam, it is characterised in that comprise the steps:
A. steam conveying pipe (4) is sent into mash gas pumping drilling (2) bottom constructed, and it is respectively provided with the relief tube stretching into mash gas pumping drilling (2) aperture place and gas pumping arm (12) at the upper and lower of steam conveying pipe (4), routinely mash gas pumping drilling (2) is carried out sealing of hole;
B. the steam conveying pipe (4) stretching out mash gas pumping drilling (2) exposed junction is connected with the explosion-proof steam generator (5) being located near boring, and the gas pumping arm (12) stretching out mash gas pumping drilling (2) exposed junction is connected with gas pumping main (14) through gate valve (13), outlet pressure table (11) and relief valve (10) are installed on the relief tube stretching out mash gas pumping drilling (2) exposed junction successively simultaneously;
The pipeline that described steam conveying pipe (4) is connected with explosion-proof steam generator (5) is provided with steam-water separator (8) at duct height step-down (9) place of turning round, and the water outlet of steam-water separator (8) is provided with drain valve group (7); The steam conveying pipe (4) of described boring exposed junction is provided with stop valve (3), and the export pipeline that described explosion-proof steam generator (5) is connected with steam conveying pipe (4) is sequentially provided with steam gage (6) and stop valve (3);
C. steam generator (5) is opened, open two stop valves (3) on vapours conveyance conduit (4), in boring, note high-temperature steam, reaches after setting pressure until steam pressure, steam off generator (5) and two stop valves (3) on steam conveying pipe (4);
D. open the gate valve (13) on extraction arm (12), carry out gas drainage under suction.
2. the method that vapours displacement gas according to claim 1 improves gas pumping efficiency, it is characterised in that: the temperature of described high-temperature steam > 100 DEG C.
3. the method that vapours displacement gas according to claim 1 improves gas pumping efficiency, it is characterised in that: the setting pressure that described steam pressure reaches is 0.7��1MPa.
4. the method that vapours displacement gas according to claim 1 improves gas pumping efficiency, it is characterised in that: described relief valve (10) is fall lift type spring safety valve.
5. the method that vapours displacement gas according to claim 1 improves gas pumping efficiency, it is characterised in that: described steam gage (6) adopts cock valve and condensed water bend pipe to be connected on steam conveying pipe (4).
6. the method that vapours displacement gas according to claim 1 improves gas pumping efficiency, it is characterised in that: the appearance of described vapours conveyance conduit (4) has glass wool material heat-insulation layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410621327.0A CN104481575B (en) | 2014-11-06 | 2014-11-06 | A kind of vapours displacement gas improves the method for gas pumping efficiency |
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| CN201410621327.0A CN104481575B (en) | 2014-11-06 | 2014-11-06 | A kind of vapours displacement gas improves the method for gas pumping efficiency |
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| CN104481575A CN104481575A (en) | 2015-04-01 |
| CN104481575B true CN104481575B (en) | 2016-06-08 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105909302B (en) * | 2016-04-21 | 2017-12-12 | 中国矿业大学 | A kind of induction hole pumping and mining later stage gas fires the anti-reflection system and technique in coal seam |
| CN105927268B (en) * | 2016-04-21 | 2017-12-15 | 中国矿业大学 | Gas fires the anti-reflection pumping method in coal seam in a kind of induction extraction later stage drilling hole |
| CN105735958A (en) * | 2016-04-27 | 2016-07-06 | 阳泉市应用技术研究所 | Method and system for increasing coal bed gas permeability based on water vapor injection |
| CN106014363B (en) * | 2016-05-18 | 2018-06-15 | 中国矿业大学 | A kind of method for improving coal mine gas extraction efficiency |
| CN110578504B (en) * | 2019-07-23 | 2020-10-27 | 重庆大学 | Partitioned fracturing cooperative directional heat drive gas extraction system and use method thereof |
| CN110374566A (en) * | 2019-07-24 | 2019-10-25 | 河南理工大学 | A kind of pumping method that ultrasound combines fracturing coal seam with high steam, desorbs gas |
| CN111472832B (en) * | 2020-04-09 | 2021-01-15 | 中国矿业大学 | Coal bed gas self-circulation gas injection yield increasing method |
| CN113027403B (en) * | 2021-05-27 | 2021-08-06 | 中国煤炭地质总局勘查研究总院 | Method for injecting hot steam into coal seam and electronic equipment |
| CN114320257B (en) * | 2021-12-30 | 2023-11-03 | 中国矿业大学 | Closed loop system and method for enhanced extraction of coal seam after burning of underground coal mine gas |
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Patent Citations (6)
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| CN101503957A (en) * | 2009-01-23 | 2009-08-12 | 赵阳升 | Aboveground and underground combined heat injection coal bed gas extraction method |
| CN101832149A (en) * | 2010-05-20 | 2010-09-15 | 太原理工大学 | Method for extracting coal seam gas by underground heat injection |
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